- Helianthus annuus is a coarse, hairy, leafy, fast growing annual that grows from 5-10 ft (1.5-3 m) tall on stiff upright stalks. It is native to dry plains, prairies, meadows and foothills in the western U. S., Canada and northern Mexico.
- The leaves are large, ovate to triangular, sandpapery and up to 12 in (30.5 cm) long.
- The 3-6 in (7.6-15 cm) wide sunflowers with orange-yellow rays and brown to purple center disks. Flowers bloom through the summer.
- The disk flowers give way to the familiar sunflower seeds. The fruits are achenes which contain one seed.
- Ecological Threat
- H. annuus is native to North America, although Iowa lists it as a State Noxious Weed. It is also considered a weed in many agricultural areas. It is grown commercially for the seeds and the oil extracted from them, both for human consumption and as a wildlife food. H. annuus contains the world's second most important and valuable oil seed. (Coconut oil comes first.) The seeds contain 35-40% oil. They are high in polyunsaturated fat and contain no cholesterol. The seeds are a good source of protein, starch and calories.
Image Sets View other image sets:
EDDMapS Distribution - This map is incomplete and is based only on current site and county level reports made by experts, herbaria, and literature. For more information, visit www.eddmaps.org
State Invasive List - This map identifies those states that list this species on their invasive species list. For more information, visit Invasive.org
Invasive Listing Sources
Other System LinksPlants: HEAN3
NPDN Pest: PBFBUBA
NPDN Host: 28021
|Common Name Reference:|| USDA, NRCS. 2010. The PLANTS Database. National Plant Data Center, Baton Rouge, LA, USA.|
|Scientific Name Reference:||USDA, NRCS. 2010. The PLANTS Database. National Plant Data Center, Baton Rouge, LA, USA.|